The Oregon legislature has approved an initiative to allow adults to use recreational use of the drug recreationally.
The measure passed the Oregon Senate on Tuesday, with two members abstaining.
The House passed the measure last week.
A majority of Oregon voters approved legalization in November 2016, when voters passed Measure 91.
The measure also legalized recreational use for adults over the age of 21, and the sale and possession of cannabis products.
Supporters say recreational use can lead to healthier lifestyles and decrease the use of prescription drugs and alcohol.
The Oregon Liquor Control Commission has allowed people to grow, process, and sell medical marijuana since January.